Installing Unit in Duct Work
CAUTION: BE SURE TO WEAR APPROPRIATE PROTECTION AS CUTTING METAL IS LOUD AND
PIECES MAY BE SHARP AND HOT (I.E. HAND, EAR, EYE, AND FACE PROTECTION)
1. Disconnect power to the HVAC system before installing the unit.
2. Cut out the template from the back page and tape it to the duct work in
intended installation position.
3. For OS36: drill pilot holes 1-5 with a 3/32” drill bit where indicated.
For OS72: drill pilot holes 1-6 with a 3/32” drill bit where indicated.
4. For OS36: cut one (1) - 2 1/2” hole in
duct as where indicated.
For OS72: cut two (2) - 2 1/2” holes
where indicated. Remove any burrs
and be sure duct surface is flat after
cutting hole(s).
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